ViewGroupUtilsHoneycomb.java 文件源码

static void offsetDescendantMatrix(ViewParent target, View view, Matrix m) {
    final ViewParent parent = view.getParent();
    if (parent instanceof View && parent != target) {
        final View vp = (View) parent;
        offsetDescendantMatrix(target, vp, m);
        m.preTranslate(-vp.getScrollX(), -vp.getScrollY());
    }

    m.preTranslate(view.getLeft(), view.getTop());

    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {
        if (!view.getMatrix().isIdentity()) {
            m.preConcat(view.getMatrix());
        }
    }
}